Ok so I've drawn some pretty lines around the rim profiles of the A23 (left), HED C2 (middle) and Bikehubstore C472 (right)...

Rush; all that work and you only took into account about 40-45% of the equation! I would suspect the Bikehubstore probably has a better advantage over the Hed when the rim is the leading edge(particularly at yaw) and much less so as a trailing edge as you depict.

Anyways, I don't think Hed themselves think that their profile is particularly aerodynamic. I think they merely mean to say that a 23mm wide rim's walls will better match the 23mm wide tires people run anyways. You must remember when they released the 23mm wide C2 rim something like 4-6 years ago they were just about the first to make a 23mm wide road racing rim. Maybe this just demonstrates they are due for an overhaul.

Your tire profile looks pretty good for a 20mm tire, but a 23mm tire will be ~25mm wide on these rims. Also, they are a little heavier than the Hed rims, which have run ~455g recently. Both of my C472s were 480g.

I thought the whole point of running a 23mm tire on a 23 mm rim was to reduce the 'light bulb' shape and ensure that the sidewalls of the tire transitioned smoothly to the rim.

Quick update: the latest batch of 24h C472s is weighing in between 475-482 grams. Another sampling from about a month ago came in at 471-476. I'm still comfortable calling it the C472w (and I'm kind of stuck with that name), but I will update this on the website.

I thought the whole point of running a 23mm tire on a 23 mm rim was to reduce the 'light bulb' shape and ensure that the sidewalls of the tire transitioned smoothly to the rim.

It does reduce it... just not very much. On a 19mm wide rim, the 23mm tire sticks out 2mm on each side. On a 23mm rim it sticks out 1 mm. Aero benefits are just one small part of the hype surrounding them...

They look exactly like a Kinlin rim... and Alchemy seemed to confirm that Kinlin has that offering... as I recall. I asked if they were planning on carrying them, and they said they'd like to check some samples first.

Who is online

Users browsing this forum: No registered users and 5 guests

You cannot post new topics in this forumYou cannot reply to topics in this forumYou cannot edit your posts in this forumYou cannot delete your posts in this forumYou cannot post attachments in this forum